Chicago has installed cameras at various intersections throughout the city. The camera photographs the license plate of any car engaging in a moving violation (such as driving through a red light or failure to completely stop prior to turning on red). Open the data set 2_2_43, which represents the number of violations recorded by all cameras on October 17, 2018. The dataset is located at www.pearsonhighered.com/sullivanstats.
(a) What type of data is “number of violations”?
(b) Is this data from a population or sample? Explain.
(c) How many red light cameras are there in the city of Chicago?
(d) Draw a relative frequency histogram of the data using a lower class limit of the first class of 0 and a class width of 5. Describe the shape of the distribution.
(e) Draw a dot plot of the data. Do you prefer the dot plot or the histogram? Explain.
(f) Were there any cameras that did not record any violations on October 17, 2018? If so, how many?